I agree with all the others ... it is your first quilt, and it looks like your first quilt ... as far as the stain, you could practice a little applique.
Get yourself some fusible web, draw a fine design, stitch the web to the right side of your fabric, right on the drawn line ... small stitches.
(don't be using double sided fusible web ... get the webbing that is woven fabric on one side and glue on the other).
After you have your stitching all done completely around, very carefully, pull the fabric and webbing away from each other, go right to the center of the webbing and cut a small X (when you turn everything right side out through that X, you will end up with an applique patch.)
Iron over the stain, use your machine or do it by hand to blanket stitch the applique in place ... the web was used to stabilize the patch in place.
If you need more information, just respond to this thread - - I will be back <g> <wave>